| 摘要 |
<p>The cladding comprises longitudinally staggered semi-tubular sections 12'. The assembled sections form a passage. Each section has at least one external projection 24. Preferably the identical semi-cylindrical sections 12' are offset by half their lengths. Preferably the strakes 24 form three almost continuous helices having a pitch = 4-6 times the diameter. Preferably the sections 12' are connected using projections and recesses (figure 4, 20 and 22). Preferably the projections 24 are hollow, compressible and triangular. The sections 12' may be made from polyurethane with metal securing bands 28 in slots (figure 3, 26). The cladding is used to reduce vortex induced vibrations in underwater pipes and cables.</p> |
